The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

Related Mcqs:

1. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ?

   A. (∂P/∂V)S = (∂P/∂V)T
   B. (∂P/∂V)S = [(∂P/∂V)T]Y
   C. (∂P/∂V)S = y(∂P/∂V)T
   D. (∂P/∂V)S = 1/y(∂P/∂V)T

2. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?

   A. Δ S1 is always Δ SR
   C. Δ S1 is always > Δ SR
   D. Δ S1 is always = Δ SR

3. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when_______________?

   A. n = y = 1.4
   B. n = 0
   C. n = 1
   D. n = 1.66

4. Work done may be calculated by the expression ∫ p dA for _____________ processes ?

   A. Non-flow reversible
   B. Adiabatic
   C. Both A. and B
   D. Neither A. nor B

5. In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?

   A. Adiabatic
   B. Reversible
   C. Isothermal
   D. None of these

6. Which of the following non-flow reversible compression processes require maximum work ?

   A. Adiabatic process
   B. Isothermal process
   C. Isobaric process
   D. All require same work

7. Which of the following processes cannot be made reversible even under ideal condition of operation ?

   A. Free expansion of a gas
   B. Compression of air in a compressor
   C. Expansion of steam in a turbine
   D. All (A), B. & (C)

8. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition?

   A. Internal energy
   B. Enthalpy
   C. Gibbs free energy
   D. Helmholtz free energy

9. In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of ‘n’ is_________________?

   A. 0
   B. 1
   C. y = 1.44
   D. 1.66

10. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _____________ process?

    A. Isothermal
    B. Isobaric
    C. Polytropic
    D. Adiabatic